The Republican chair of the House Oversight Committee is demanding that former President Joe Biden's White House physician testify before the panel — ramping up a congressional investigation into Biden's age and health.

Rep. James Comer, a Kentucky Republican, sent a letter to Dr. Kevin O'Connor on Thursday subpoenaing him to testify at a June 27 deposition. He said the committee wants details about "your assessment of and relationship with former President Biden."

House Oversight had requested last month that O'Conner appear for a transcribed interview, Comer wrote, but the doctor's attorneys declined, citing local laws and medical ethics rules that generally discourage physicians from disclosing confidential information about their patients. Comer wrote that those "arguments

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